How to populate options of h:selectOneMenu from database?

Question

I am creating a web application, where you have to read a list of objects / entities from a DB and populate it in a JSF . I am unable to

Answer 1

I'm doing it like this:

1. Models are ViewScoped

2. converter:

   @Named
   @ViewScoped
   public class ViewScopedFacesConverter implements Converter, Serializable
   {
           private static final long serialVersionUID = 1L;
           private Map converterMap;
   
           @PostConstruct
           void postConstruct(){
               converterMap = new HashMap<>();
           }
   
           @Override
           public String getAsString(FacesContext context, UIComponent component, Object object) {
               String selectItemValue = String.valueOf( object.hashCode() ); 
               converterMap.put( selectItemValue, object );
               return selectItemValue;
           }
   
           @Override
           public Object getAsObject(FacesContext context, UIComponent component, String selectItemValue){
               return converterMap.get(selectItemValue);
           }
   }
   

and bind to component with:

If you will use entity id rather than hashCode you can hit a collision- if you have few lists on one page for different entities (classes) with the same id